jetty官网实例1:http://git.eclipse.org/c/jetty/org.eclipse.jetty.project.git/tree/examples/embedded/src/main/java/org/eclipse/jetty/embedded/
jetty官网实例2:https://github.com/eclipse/jetty.project/blob/jetty-9.3.x/examples/embedded/src/main/java/org/eclipse/jetty/embedded/LikeJettyXml.java